一个水罐装了总容积四分之三的菠萝汁，把水罐里所有的菠萝汁平均倒到5个杯子里．那么每个杯子里菠萝汁的量占了水罐总容量的百分之几？

A. 5

B. 10

C. 15

D. 20

E. 25

1. 2020 AMC 8 官方解析

Each cup received one fifth of three fourths of the pitcher. This corresponds to a percentage of
$\frac{1}{5} \cdot \frac{3}{4} = \frac{3}{20} = \frac{15}{100} = 15\%$.
每个杯子被倒入果汁的量为壶中四分之三容量的五分之一．故每个杯子里的果汁占壶的总容量的百分比为$\frac{1}{5} \cdot \frac{3}{4} = \frac{3}{20} = \frac{15}{100} = 15\%$.

The juice filled up $75\%$ of the pitcher, so each of the 5 cups received
$\frac{1}{5} \cdot 75\% = 15\%$.
果汁填满了壶的$75\%$，所以5个杯子中的每杯都被倒入了
$\frac{1}{5} \cdot 75\% = 15\%$.